The term the kids are using these days to describe this is "freemium". I don't use that term, but the kids do.
Actually here is a quote from the dev:
Regarding price drop. HERE is our statement. The main reason: piracy rate on Android devices, that was unbelievably high. At first we intend to make this game available for as many people as possible – that’s why it was for as little as buck. – It was much less than 8$ for SHADOWGUN but on the other hand we didn’t dare to provide it for free, since we hadn’t got XP with free-to-play format so far. – However, even for one buck, the piracy rate is soooo giant, that we finally decided to provide DEAD TRIGGER for free. Anyway – DEAD TRIGGER is not FREEMIUM, it always was and still remains FREE-TO-PLAY, that means, all play‐ers are able to play it without IAP! We stand up for this statement, because all members of our team are playing (and enjoying) DEAD TRIGGER with‐out IAP.
There is a new halloween update for this. Will bring some new life to it.
What's in this version:
The most visually stunning update for DEAD TRIGGER is here!
HALLOWEEN has arrived in The City!
* Visit new arena: HAUNTED GRAVEYARD. It’s the scariest place in the City!
* Enjoy a new weapon! The CROSSBOW is equipped with blazing ballistics!
* Slaughter crowds of HALLOWEEN “PUMPKIN-HEAD” ZOMBIES
* Don’t forget to get MINIGUN – provided at a reduced price!
* BLAST the pumpkin heads and watch them roll around based on realistic physics!
* AlienGun EFFECT optimization for slower devices
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